Muwatta Malik #350
Shortening the Prayer
Yahya related the same as that to me from Malik from Zayd ibn Aslam from his father from Umar ibn al-Khattab.
About Muwatta Malik
This hadith is #350 from Muwatta Malik, in the Book of Shortening the Prayer. Muwatta Malik contains 1,985 hadiths across 61 books.